Acoustic resonance technology
Acoustic resonance technology (ART) is an
ART differs from traditional ultrasonic testing: although both are forms of nondestructive testing based on acoustics, ART generally uses lower frequencies and has a wider bandwidth. This has enabled its use in gaseous environments without a liquid couplant.
ART has also been used in field tests[2] at Gassco's Kårstø facility.
In 2012, DNV's ART activities were spun out into a subsidiary, HalfWave, and was further developed through investment by Shell Technology Ventures, Chevron Technology Ventures, and Energy Ventures.
In 2020, Halfwave was acquired by Previan, who shared the technology between two of its business units, NDT Global, for its In-Line Inspection (ILI) solutions and TSC Subsea for subsea applications.
TSC Subsea has a long history of developing subsea inspection robotics, deploying multiple non-destructive testing (NDT) techniques. Since the merger, substantial enhancements have been made to the ART technology. As a result, Acoustic Resonance Technology has proven to penetrate thick subsea attenuative coatings of more than 100mm (4 inches).
TSC Subsea has successfully deployed ART with its Artemis solution to inspect subsea pipelines, flowlines, and flexible and rigid risers down to water depths of 3000m (10,000ft.)
Main features
- Uses lower frequencies than ultrasonic testing
- Effective in gases and liquids (i.e. requires no liquid couplant)
- Can be used to characterize multi-layered media (e.g. pipelines with coatings)
- Can penetrate coatings
- Can measure inside and outside metal loss
RUV (resonance ultrasonic vibrations)
In a closely related technique, the presence of cracks in a solid structure can be detected by looking for differences in resonance frequency, bandwidth and resonance amplitude compared to a nominally identical but non-cracked structure. This technique, called RUV (Resonance Ultrasonic Vibrations), has been developed for use in the photovoltaics industry by a group of researchers from the University of South Florida, Ultrasonic Technologies Inc. (Florida, US), and Isofoton S.A. (Spain).[3] The method was able to detect mm-size cracks in as-cut and processed silicon wafers, as well as finished solar cells, with a total test time of under 2 seconds per wafer.
References
- ^ http://en.breivoll.no/white_papers/ Archived 13 July 2012 at archive.today Whitepaper on condition assessment of water pipes with the use of ART at Breivoll Inspection Technologies, February 2012.
- ^ Press release from Gassco, 29 May 2009
- .